Question: When did Pedro I's child Miguel die, Prince of Beira born, and who was his mother?
Paraphrase: When did Pedro I and his wife's child Miguel die?
SPARQL (Wikidata): SELECT ?value1 ?value2 WHERE { wd:Q939 p:P40 ?s . ?s ps:P40 wd:Q3856483 . ?s pq:P570 ?value1 . ?s pq:P25 ?value2 }